JP2011033460A - Navigation system, on-vehicle unit, navigation method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique always changing a correspondence relation between present position data and map image data of a vehicle superimposed on a guide image into a relation showing an actual vehicle position, in a navigation system wherein a server or a portable terminal cooperates with an on-vehicle unit by communication. <P>SOLUTION: A data providing device transmits present position data and cut-out map image data cut out from map image data respectively to the on-vehicle unit, and transmits a transmission period of the present position data more shortly than a transmission period of the cut-out map image data. The on-vehicle unit displays the present position data and the cut-out map image data received from the data providing device superimposedly on the guide image, and updates the present position data, while maintaining the cut-out map image data, when receiving the present position data. When the present position data are positioned on an updated position in the periphery of the cut-out map image data, the correspondence relation between the present position data and the map image data of the vehicle superimposed on the guide image can be always changed into the relation showing the actual vehicle position, by updating the cut-out map image data. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for realizing a navigation function by providing a map image from a data providing device to an in-vehicle device mounted on a vehicle.

  Using the global positioning system (GPS = Global Positioning System), GPS data indicating where the vehicle is currently on the earth is calculated, and the vehicle position mark is superimposed on the map image based on this GPS data There is known a car navigation system that displays an object on a display of an in-vehicle device. FIG. 1 is a block diagram showing this car navigation system. The in-vehicle device is mounted on a vehicle such as the automobile 5. The GPS data is calculated based on radio waves emitted by three or more GPS satellites 4 received by the in-vehicle device. As shown in FIG. 2, the process of superimposing the vehicle position mark and the map image data is performed by fixing the vehicle position mark d at a predetermined position of the map image data displayed on the display, and displaying the vehicle position mark d at the present time. The map image data is updated and displayed in accordance with the GPS data that changes with the movement of the vehicle. That is, a display as if the own vehicle position mark d is moving is performed by updating and displaying the surrounding map according to the movement of the vehicle. For example, the map image data is updated and displayed from map image data G1 to G2 and from G2 to G3 in FIG.

  In addition, with the improvement of the performance of mobile terminals such as mobile phones and PDAs (Personal Digital Assistants), navigation systems using GPS have also been realized in these mobile terminals. In such a navigation system, the functions are shared between the mobile terminal and the server that performs wireless communication with the mobile terminal. Regarding the function sharing, for example, the mobile terminal is in charge of a position data acquisition function, a destination setting function, a map matching function, a display function, etc., and the server is a map image storage function, a route search function, and a map image cutout I am in charge of functions. By sharing functions in this way, resources are distributed and shared to reduce costs.

  However, when a user carrying a terminal equipped with a navigation system gets on a vehicle equipped with a car navigation system, resources for realizing the navigation function overlap. As a system that eliminates resource duplication and effectively uses resources, a car navigation system that shares the data necessary for navigation while distributing the resources has been proposed for in-vehicle devices, portable terminals, and servers. Yes. For example, Patent Document 1 discloses a technique in which a vehicle-mounted device acquires a map image used for car navigation from a server by communication via a mobile phone.

Japanese Patent Laid-Open No. 2002-107169

  In this way, in a system that provides navigation data to a vehicle-mounted device from a data providing device such as a server or a portable terminal, a map image data storage function in which the server stores map image data, a route search function, and route surrounding map image data It is conceivable that the mobile terminal is in charge of the extraction function, the mobile terminal is in charge of the map image cutting function, the GPS data detection function, and the coordinate data calculation function, and the in-vehicle device is in charge of the display function of map image data and the like. In order to exert such functions, it is important to have sufficient communication capability between devices (for example, between a server and a portable terminal, between a portable terminal and an in-vehicle device), which is an element that links the functions. It is.

  That is, when the communication capability for linking each function is low, the linkage between the functions is inferior, and the functions of the navigation system may not be sufficiently exhibited.

  For example, if the position data acquired from the GPS communication unit mounted on the vehicle changes in an instant due to the vehicle moving at a high speed of 40 km or higher, the acquisition processing of the map image data having a relatively large amount of data is performed at the communication speed. The vehicle position mark indicating the current position and appropriate map image data corresponding thereto may not be displayed on the display unit of the in-vehicle device due to the delay of the vehicle. That is, there is a possibility that the own vehicle position mark is greatly deviated from the actual vehicle position in the navigation guidance image. The present invention has been made in view of the above problems, and in a navigation system that provides navigation data from a data providing device to an in-vehicle device, in a navigation guidance image, there is a correspondence between the current position data of the vehicle and map image data. Another object of the present invention is to provide a technique that can display the actual position of the vehicle.

  In order to solve the above-described problem, the invention of claim 1 is a navigation system including an in-vehicle device mounted on a vehicle and a data providing device that provides navigation-related data to the in-vehicle device. Detection means for detecting current position data of the vehicle, storage means for storing map image data, map image cutting means for cutting out a map image having a display size in the in-vehicle device from the map image data, and detection means. Transmission means for individually transmitting the detected current position data and the extracted map image data cut out by the map image cutting means to the in-vehicle device, the in-vehicle device from the data providing device Receiving means for receiving the current position data and the extracted map image data; and the received current position data and the extracted map image data. Display means for displaying a guidance image by superimposing data, wherein the transmission means makes a transmission cycle of the current position data shorter than a transmission cycle of the cut-out map image data, and the display means includes: When the receiving means receives the current location data, the current location data is updated while maintaining the extracted map image data, and the current location data is updated at an update position around the extracted map image data. The clipped map image data is updated when positioned.

  According to a second aspect of the present invention, in the navigation system according to the first aspect, the data providing device includes a vehicle speed detection unit that detects a vehicle speed of the vehicle, and the transmission unit is configured so that the vehicle speed is equal to or lower than a predetermined vehicle speed. Means for transmitting decoration data for decorating the cut-out map image data to an in-vehicle device, and the display means of the in-vehicle device includes the current position data, the cut-out map image data, and the decoration data. The guide image is displayed in a superimposed manner.

  The invention according to claim 3 is the navigation system according to claim 1 or 2, wherein the data providing device transmits display order data indicating an order in which data used for the guide image is superimposed. And the display unit of the vehicle-mounted device displays the guide image by superimposing data based on the display order data.

  According to a fourth aspect of the present invention, in the navigation system according to any one of the first to third aspects, the map image cutting means of the data providing device includes a route map image along a guide route to a destination, The adjacent map image adjacent to the route map image is cut out as the cut-out map image data, and the display unit of the vehicle-mounted device is based on the current position data when updating the cut-out map image data. The extracted map image data used for the guide image is selected from the route map image and the adjacent map image.

  The invention of claim 5 is an in-vehicle device mounted on a vehicle that receives provision of data related to navigation from the data providing device, wherein the data providing device detects and accumulates current position data of the vehicle. The cut-out map image data of the display size in the vehicle-mounted device is cut out from the existing map image data, and the detected current position data and the cut-out map image data are individually transmitted to the vehicle-mounted device, and the current position The data transmission cycle is shorter than the cut-out map image data transmission cycle, receiving means for receiving the current position data and the cut-out map image data from the data providing device, and the received current Display means for displaying a guide image by superimposing position data and the cut-out map image data, and the display means includes the receiving means When receiving the current position data, while maintaining the extracted map image data, update the current position data, and when the current position data is located at the update position around the extracted map image data, The cut-out map image data is updated.

Further, the invention of claim 6 is the vehicle-mounted device according to claim 5, wherein the display order data indicating the order in which the data used for the guide image is superimposed is received from the data providing device,
The display means displays the guide image by superimposing data based on the display order data.

  The invention of claim 7 is a navigation method in a navigation system having an in-vehicle device mounted on a vehicle and a data providing device for providing navigation-related data to the in-vehicle device, wherein the data providing device is A detection step of detecting current position data of the vehicle, a map image cutting step in which the data providing device cuts out a map image having a display size in the in-vehicle device from the accumulated map image data, and the data providing device are detected. Transmitting the current position data and the cut out cutout map image data to be stored individually to the in-vehicle device, and the in-vehicle device sends the current position data and the cut out map image data from the data providing device. Receiving step, and the in-vehicle device receives the current position data and the cut map A display step of displaying a guide image superimposed on the image data, and in the transmission step, a transmission cycle of the current position data is shorter than a transmission cycle of the cut-out map image data, and in the display step, When the current position data is received, the current position data is updated while maintaining the extracted map image data, and the current position data is located at an update position around the extracted map image data. The cut-out map image data is updated.

  The invention of claim 8 is a program that is mounted on a vehicle and that can be executed by a computer included in an in-vehicle device that receives navigation-related data from a data providing device, and the data providing device The position data is detected, and the cut-out map image data having the display size in the vehicle-mounted device is cut out from the accumulated map image data, and the detected current position data and the cut-out map image data are individually separated from the vehicle-mounted device. And the transmission cycle of the current position data is shorter than the transmission cycle of the extracted map image data, and the execution of the program by the computer is performed by the computer from the data providing device to the current Receiving the position data and the extracted map image data; and the received current position And displaying the guidance image by superimposing the cut-out map image data and the cut-out map image data, and updating the current position data while maintaining the cut-out map image data when receiving the current position data And a step of updating the clipped map image data when the current position data is located at an update position around the clipped map image data.

  According to the first to eighth aspects of the present invention, the data providing apparatus sets the transmission cycle of the current position data having a higher update frequency and a smaller amount of data than the extracted map image data to the transmission cycle of the extracted map image data. The update display processing in the in-vehicle device is not delayed. Therefore, the current position data of the vehicle can be reflected almost in real time. That is, the correspondence relationship between the current position data of the vehicle to be superimposed on the guidance image and the map image data can always be a relationship that represents the actual position of the vehicle.

  According to the invention of claim 2, when the vehicle speed is low or when the vehicle is stopped, it is considered that there is no problem even if the display accuracy of the current position data is somewhat inferior. In that case, the map image data is decorated. By transmitting the decoration data, it is possible to appropriately display the decoration data in the guide image, and the communication of other data is not affected.

  Moreover, according to the invention of Claim 3 and Claim 6, the data used for the guidance image from which transmission timing mutually differs can be superimposed in an appropriate order.

  According to the invention of claim 4, even if the current position data deviates from the guidance route, it is possible to use appropriate cut-out map image data for the guidance image based on the current position data.

FIG. 1 is a diagram illustrating the configuration of a navigation system. FIG. 2 is a diagram showing a display map image in the navigation system. FIG. 3 is a diagram illustrating the configuration of the navigation system. FIG. 4 is a system block diagram of the in-vehicle device. FIG. 5 is a system block diagram of the mobile terminal. FIG. 6 is a system block diagram of the server. FIG. 7 is a flowchart showing the operation of the navigation system. FIG. 8 is a flowchart showing the operation of the navigation system. FIG. 9 is a flowchart showing the operation of the navigation system. FIG. 10 is a flowchart showing the operation of the navigation system. FIG. 11 is a flowchart showing the operation of the navigation system. FIG. 12 is a flowchart showing the operation of the navigation system. FIG. 13 is a flowchart showing the operation of the navigation system. FIG. 14 is a flowchart showing the operation of the navigation system. FIG. 15 is a flowchart showing the operation of the navigation system. FIG. 16 is a flowchart showing the operation of the navigation system. FIG. 17 is a diagram showing route periphery map image data in the navigation system. FIG. 18 is a diagram showing cut map image data in the navigation system. FIG. 19 is a diagram showing a data structure. FIG. 20 is a diagram showing a superimposed display of data. FIG. 21 is a diagram illustrating the configuration of the navigation system.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

<Embodiment>
<1. First Embodiment>
<1.1 Navigation system configuration>
FIG. 3 is a configuration diagram illustrating the navigation system 100 according to the first embodiment. The navigation system 100 includes an in-vehicle device 1 mounted on a vehicle such as an automobile 5, a mobile terminal 2 that is a data providing device, and a server 3. The in-vehicle device 1 transmits and receives data related to navigation by performing short-range wireless communication with the mobile terminal 2 based on, for example, the Bluetooth (registered trademark) standard. For communication, wired communication such as USB connection may be used. The mobile terminal 2 performs short-range wireless communication with the in-vehicle device 1 to transmit / receive data related to navigation, etc., and performs wireless communication with the GPS satellite 4 to receive data for measuring the current position. Furthermore, the mobile terminal 2 performs wireless communication with the server 3 to transmit / receive data related to navigation. The GPS satellite 4 wirelessly communicates with the portable terminal 2 and transmits data for measuring the current position. The server 3 performs wireless communication with the mobile terminal 2 to transmit / receive data related to navigation. In the navigation system 100, the in-vehicle device 1, the mobile terminal 2, and the server 3 realize a navigation function to be described later based on navigation-related data acquired through such communication.

  In the navigation system 100 of the present embodiment, the mobile terminal 2 and the server 3 operate in cooperation to provide navigation-related data to the in-vehicle device 1. Therefore, it can be said that the combination of the portable terminal 2 and the server 3 is a data providing apparatus that provides data related to navigation to the in-vehicle device 1.

  Further, GPS data, current position coordinate data calculated based on GPS data to be described later, and the vehicle position mark d are data for indicating the position of the vehicle on the earth in the navigation system 100. Therefore, it can be said that each of these data is current position data.

  In the navigation system according to the present invention, the vehicle position mark d indicating the current position is fixed on the display screen of the vehicle-mounted device, and the map image data around the current position is updated in accordance with the movement of the vehicle. Contrary to the navigation method to be displayed, the vehicle position mark d is updated and displayed so as to move on the map according to the movement of the vehicle while maintaining the displayed map. A navigation system that updates and displays the map image data only when the map moves and moves off is adopted.

In this way, in the in-vehicle device 1, the map image data acquisition process with a relatively large amount of data is delayed due to a communication speed delay or the like, and the map image data corresponding to the vehicle position mark d indicating the current position is in-vehicle. It is possible to solve the problem that the display cannot be superimposed on the display unit of the machine. Detailed means for solving this will be described later.
<1.1.1 System block diagram>
(In-vehicle device)
FIG. 4 is a system block diagram of the in-vehicle device 1. The in-vehicle device 1 is a control unit 10 that performs various controls to realize a navigation function or a music playback function, and a map image that becomes a guidance screen that highlights the route z to the destination and guides it to the destination. And a display / operation unit 11 (for example, a touch panel) for receiving user operations, an operation unit 12 for receiving other user operations, a sound output unit 13 for outputting music, sound effects during operation, and the like, necessary for control A storage unit 14 for storing data (for example, Flash Memory), a short-range wireless communication unit 15 capable of communicating with a communication partner within a predetermined distance, for example, within a radius of 10-100 m, according to the Bluetooth (registered trademark) standard, and input / output Unit 16 (I / F) is provided. The input / output unit 16 includes a rotation detection unit 6 (for example, a gyro sensor) that detects rotation in the traveling direction of the vehicle connected to the in-vehicle network 8 (for example, Control Area Network), and a vehicle speed that detects the moving speed of the vehicle. A signal indicating a detection value from the detection unit 7 (for example, a vehicle speed sensor) is received via the in-vehicle network. The rotation detection unit 6 and the vehicle speed detection unit 7 are external devices provided separately from the vehicle-mounted device 1 in the vehicle.

  When the navigation function is realized, the guidance screen is displayed on the display / operation unit 11. In addition, data related to navigation such as map images and position data provided from the mobile terminal 2 is received by the short-range wireless communication unit 15, and data related to navigation transmitted from the in-vehicle device 1 to the mobile terminal 2 is also included in the short-range wireless communication unit 15. Send by.

  The control unit 10 is constituted by a microcomputer provided with a CPU and the like. The control unit 10 realizes a function related to the navigation system when the CPU performs arithmetic processing according to a program stored in a predetermined memory (for example, ROM). This program is stored in advance in the storage unit 14 or the like, but may be updated by communication with an external server, reading of a recording medium storing the program, or the like.

  The main navigation functions realized by the control unit 10 include the following (A) to (D).

  (A) A display function in which the control unit 10 displays on the display / operation unit 11 a guide image in which the cut-out map image data, decoration data, and the vehicle position mark received by the short-range wireless communication unit 15 are superimposed. .

  (B) A decoration data update display control function in which the control unit 10 updates the decoration image received by the short-range wireless communication unit 15 in the guide image displayed on the display / operation unit 11.

  (C) A vehicle position mark update display control function in which the control unit 10 updates the vehicle position mark d received by the short-range wireless communication unit 15 in the guide image displayed on the display / operation unit 11.

  (D) When the current position coordinate data received by the short-range wireless communication unit 15 is included in the update position, the control unit 10 updates the extracted map image data in the guide image displayed on the display / operation unit 11. Cut map image data update display control function.

  Details of these functions will be described later.

Moreover, the control part 10 controls each part of the vehicle equipment 1 in order to perform a step required in order to implement | achieve the navigation function mentioned later.
(Mobile device)
FIG. 5 is a system block diagram of the mobile terminal 2. The mobile terminal 2 includes a control unit 20 that performs various controls in order to realize a call function, a navigation function, and the like, a display unit 21 that displays a telephone number when making a call, an operation unit 22 that receives a user operation, A sound output unit 23 for outputting the voice of the other party during a call, a sound effect during operation, or a ring tone when receiving an e-mail; a sound input unit 24 for inputting a voice spoken with the other party during a call; A storage unit 25 (for example, Flash Memory) that stores data necessary for control, a call communication unit 26 that transmits and receives call data to communicate with other portable terminals through wireless communication, and a signal transmitted from the GPS satellite 4 are received. A GPS communication unit 27, a communication unit 28 that transmits and receives data related to the server and navigation by wireless communication, and a predetermined distance, for example, a radius of 10-10 A short-range wireless communication unit 29 capable of data communication with a communication partner within 0 m according to the Bluetooth (registered trademark) standard is provided.

  In a scene where the navigation system 100 of the present embodiment functions, the portable terminal 2 is carried by the user (vehicle driver) and is therefore located in the vehicle. Therefore, the GPS communication unit 27 acquires GPS data that is current position data of the vehicle.

  The control unit 20 is configured by a microcomputer provided with a CPU and the like. The control unit 20 realizes a navigation-related function by the CPU performing arithmetic processing according to a program stored in a predetermined memory (for example, ROM). This program is stored in advance in the storage unit 25 or the like, but may be updated by communication with an external server, reading of a recording medium storing the program, or the like.

  The main navigation functions realized by the control unit 20 include the following (E) to (J).

  (E) Based on the GPS data received by the GPS communication unit 27, the control unit 20 calculates current position coordinate data indicating where in the route surrounding map image data the vehicle position mark is located. function.

  (F) A map image cutout processing function in which the control unit 20 cuts out a data amount suitable for the size displayed on the display / operation unit 11 of the in-vehicle device 1 from the route surrounding map image data received from the server 3 by the communication unit 28.

  (G) A data processing function in which the control unit 20 processes the cut-out map image data cut out, the decoration data received from the server 3 by the communication unit 28, and the current position coordinate data.

  (H) A decoration data control processing function in which the control unit 20 transmits decoration data based on the vehicle speed data received from the vehicle-mounted device 1 by the short-range wireless communication unit 29.

  (I) Based on the GPS data received by the GPS communication unit 27, the control unit 20 calculates where the vehicle position mark d is located in the coordinates of the cut-out map image data. Current position coordinate data control processing function to transmit to the vehicle-mounted device 1 at timing.

  (J) A cut-out map image data control function in which the control unit 20 transmits the cut-out map image to the in-vehicle device 1 at a predetermined timing.

  Details of these functions will be described later.

In addition, the control unit 20 controls each unit of the mobile terminal 2 in order to execute steps necessary for realizing a navigation function described later.
(server)
FIG. 6 is a system block diagram of the server 3. The server 3 controls the control unit 30 that performs various controls in order to realize a content providing function such as navigation information, and performs administrator operations to perform settings necessary for control or maintenance of control programs and control data. Operation unit 31 that accepts, display unit 32 that displays a setting screen or a maintenance screen, a storage unit 33 that accumulates content such as a map image, and a communication unit that transmits and receives data related to navigation with the portable terminal 2 by wireless communication 34 is provided.

  The control unit 30 is configured by a microcomputer provided with a CPU and the like. The control unit 30 realizes a navigation-related function when the CPU performs arithmetic processing according to a program stored in a predetermined memory (ROM).

  The main navigation functions realized by the control unit 30 include the following (K) to (M).

  (K) The control unit 30 has a route creation function for creating a guidance route based on the vehicle GPS data and destination data received from the mobile terminal 2 by the communication unit 34.

  (L) The control unit 30 has a route peripheral image creation function that creates a map image around a route from the storage unit 33 based on the created route.

  (M) The control unit 30 has a decoration data creation function for creating decoration data for decorating route peripheral image data by extracting from the storage unit 33.

  Details of these functions will be described later.

  Further, the control unit 30 controls each unit of the server 3 in order to execute steps necessary for realizing a navigation function described later.

<1.1.3 Navigation system control processing>
<Mobile linkage control processing>
(In-vehicle device)
The control process which the control part 10 with which the vehicle equipment 1 is provided performs is demonstrated. When the ignition key of the vehicle is operated by the user and the ACC (accessory) is turned on by the user, the control unit 10 is supplied with electric power from the power source (battery), and can execute various control processes. When the control unit 10 is in a state where various control processes can be executed, the control process corresponding to the content operated by the user in the display / operation unit 11 or the operation unit 12 is executed. For example, the in-vehicle device 1 displays a menu for allowing the user to select various functions such as a navigation function, a music playback function, or a mobile link function on the display / operation unit 11, and the user can When the cooperation function is selected, the control unit 10 executes a control process for realizing the mobile cooperation function.

  In order to realize the mobile link function, it is necessary to execute pairing control in order to establish communication with the mobile terminal 2 or the server 3. Here, in the pairing control, the control unit 20 of the mobile terminal 2 controls the short-range wireless communication unit 21 to establish wireless communication with the short-range wireless communication unit 15 of the in-vehicle device 1. Control that establishes wireless communication with the communication unit 34 of the server 3 by controlling the communication unit 28.

The control unit 10 of the in-vehicle device 1 displays a plurality of content providing service menus on the display / operation unit 11 after the pairing control is established. For example, the menu includes a navigation providing service, a music providing service, or a news providing service. When the navigation service is selected, the control unit 10 of the in-vehicle device 1 executes the selected navigation system in cooperation with the mobile terminal 2 and the server 3.
(Mobile device)
A control process executed by the control unit 20 included in the mobile terminal 2 will be described. When the power button provided on the mobile terminal is turned on by the user, the control unit 20 is supplied with power from the power source (battery) and can execute various control processes. When the control unit 20 is in a state where various control processes can be executed, the control process corresponding to the content of the operation of the operation unit 22 by the user is executed. For example, the mobile terminal 2 is configured such that the user can operate various functions such as a call function, an internet browsing function, or a mobile link function in the operation unit 22. When the user selects the mobile link function using the operation unit 22, the control unit 20 executes a pairing control process in order to realize the mobile link function.

When the navigation service is selected in the in-vehicle device 1 after establishing the pairing control, the control unit 20 executes the navigation providing service in cooperation with the in-vehicle device 1 and the server 3.
(server)
A control process executed by the control unit 30 included in the server 3 will be described. When the power button provided on the server 3 is operated and turned on by the administrator, the control unit 30 is supplied with power from the power source (commercial power source) and can execute various control processes. When the control unit 30 is in a state where various control processes can be executed, the control process or the content provision control process corresponding to the content of the operation of the operation unit 31 by the administrator is executed. That is, execution of the content provision control process is selected by the operation of the operation unit 31 by the administrator, and the route z and the control unit 30 provide content such as a map image in response to a request from a client such as the in-vehicle device 1 or the mobile terminal 2. To do. In order to realize the mobile link function from the mobile terminal 2 as a client, there is a request for execution of pairing control z, and the pairing control is executed in response to this request.

  When the navigation service is selected in the in-vehicle device 1 after establishing the pairing control, the control unit 30 executes the navigation providing service in cooperation with the portable terminal 2 and the server 3.

  Hereinafter, control of the vehicle-mounted device 1, the portable terminal 2, and the server 3 when the navigation providing service is selected by the user from the content providing service menu displayed on the display / operation unit 11 of the vehicle-mounted device 1 will be described. .

<Navigation control processing>
In FIG. 7, a navigation providing service executed by the navigation system 100 will be described. The control unit 10 of the in-vehicle device 1, the control unit 20 of the portable terminal 2, and the control unit 30 of the server 3 each execute a main routine shown in FIG.

<Main routine>
A main routine executed by each control unit will be described with reference to FIGS. 7, 8, and 9.

  A main routine in the in-vehicle device 1 will be described with reference to FIG.

  In S100, the control unit 10 of the in-vehicle device 1 executes an initial process which is a subroutine. The initial process refers to processes such as data provision, data acquisition, and data display that are required at the beginning when the vehicle-mounted device 1 serving as a part of the navigation system 100 executes the navigation process. After executing the initial process, the control unit 10 proceeds to S101.

  In S101, the control unit 10 executes main processing that is a subroutine. The main process refers to processes such as data provision, data acquisition, and data display that are required while the in-vehicle device 1 serving as a part of the navigation system 100 is executing the navigation process. After executing the initial process, the control unit 10 ends the navigation providing service and returns to the original control process.

  A main routine in the portable terminal 2 will be described with reference to FIG.

  In S200, the control unit 20 of the mobile terminal 2 executes an initial process which is a subroutine. This initial process is a process executed by the mobile terminal 2 in the same manner as the above-described initial process. After executing the initial process, the control unit 20 proceeds to S201.

  In S201, the control unit 20 executes a main process which is a subroutine. This main process is a process executed by the mobile terminal 2 in the same manner as the main process described above. After executing the initial process, the control unit 20 ends the navigation providing service and returns to the original control process.

  A main routine in the server 3 will be described with reference to FIG.

  In S300, the control unit 30 of the server 3 executes an initial process which is a subroutine. This initial process is a process executed by the server 3 in the same manner as the initial process described above. After executing the initial process, the control unit 30 proceeds to S301.

  In S301, the control unit 30 executes a main process which is a subroutine. The main process is a process executed by the server 3 in the same manner as the main process described above. After executing the initial process, the control unit 30 ends the navigation providing service and returns to the original control process.

<Subroutine>
Subroutines executed by each control unit will be described with reference to FIGS. 10, 11, 12, 13, 14, 15, and 16. FIG.
<1.2.2.3 Initial processing>
When the navigation system 100 executes a navigation process, initial processes such as provision of necessary data, acquisition of data, and display of data are performed. This initial process will be described with reference to FIG.

<Route search processing>
In S103, the control unit 10 of the in-vehicle device 1 transmits the destination data set by the user to the server 3 via the mobile terminal.

  In S <b> 203, the control unit 20 of the mobile terminal 2 transmits GPS data to the server 3.

  In S303, the control unit 30 of the server 3 uses the route creation function to create a travel route based on the received destination data, GPS data, and map image data stored in the storage unit 33 (map image database). . The creation of the route z is realized, for example, by referring to characteristics associated with roads existing from the current position of the map image data to the destination and combining roads according to the concept of each route.

<Route surrounding image data creation processing>
In S <b> 304, the control unit 30 of the server 3 extracts the created map image data around the route from the storage unit 33 using the route periphery image data creation function. For example, the route surrounding map image data 1000 shown in FIG. An address is assigned to the route periphery map image data 1000. That is, with the horizontal direction shown in FIG. 17 as the X axis and the vertical direction as the Y axis, a plurality of lines are set for each axis, and a unique number is set for each line. The address is composed of numbers on the vertical axis (X) and the horizontal axis (Y), for example, X: Y = 350: 20.

  This address is necessary when executing the superimposing process on the display / operation unit 11 of the in-vehicle device 1 for the decoration data, the vehicle position mark d, and the cut-out map image data, which will be described later.

  In S <b> 305, the control unit 30 of the server 3 transmits the extracted route periphery map image data 1000 to the mobile terminal 2.

<Decoration data extraction process>
In S <b> 306, the control unit 30 of the server 3 extracts data for decorating the route surrounding map image data 1000 from the storage unit 33 by the decoration data extraction function. The decoration data includes, for example, each name such as an address, street name, place name, station name, school name, fire signature, police signature, ward office name, gymnasium name, or park name in the route periphery map image data 1000, and a facility. This mark decorates route surrounding map image data. In addition, the decoration data is given coordinate data indicating where the route peripheral map image data 1000 is located.

  In S <b> 307, the control unit 30 of the server 3 transmits the decoration data to the mobile terminal 2.

<Current position coordinate data calculation processing>
In S204, the control unit 20 of the mobile terminal 2 calculates current position coordinate data by the current position coordinate data calculation function. Based on a signal transmitted from the GPS satellite 4 received by the GPS communication unit 27, GPS data indicating the position of the vehicle on the earth at the time of reception is calculated. Based on this GPS data, the control unit 20 calculates current position coordinate data indicating where the vehicle position mark d is located in the route surrounding map image data 1000. The current position coordinate data is composed of numbers on the vertical axis (X) and the horizontal axis (Y), for example, X: Y = 100: 15.

<Map matching process>
Further, the control unit 20 of the portable terminal 2 receives data (data indicating speed, gear speed, direction, etc.) from various sensors provided in the vehicle from the in-vehicle device 1 by the map matching function, and these data and coordinate data. Based on the map matching. Map matching is to determine whether there is any similarity between the vehicle travel locus calculated based on the detection data of various sensors and the road line in the cut-out map image. The position is set to “true”, a difference coefficient k between the coordinate set to “true” and the current position coordinate data is obtained, and the correction term is set as a correction term to the current position coordinate data calculated by the current position coordinate data calculation processing. It means to multiply.

  In S205, the control unit 20 of the portable terminal 2 transmits the current position coordinate data after the map matching to the in-vehicle device 1. The in-vehicle device 1 stores the extracted map image and the current position coordinate data in the storage unit 14.

<Map image cutout processing>
In S <b> 206, the control unit 20 of the mobile terminal 2 stores the route peripheral map image data 1000 received from the server 3 in the storage unit 25 by the map image cutout function, and the vehicle-mounted from the stored route peripheral map image data 1000. A plurality of map image data having a size suitable for the guide image displayed on the display / operation unit 11 of the machine 1 and having different ranges along the route z are cut out and generated. Hereinafter, this map image is referred to as a main cut map image.

  For example, the main cut-out map images are shown in FIG. This is map image data of M48, M49, M52, M59, M62, M65, M71, M72, M73, M74, M80, M83, M86, M90, and M91.

  The reason why such processing is performed is that the route surrounding map image data 1000 includes the entire route z, so that the guide image displayed on the display / operation unit 11 of the in-vehicle device 1 is too large to be suitable. is there.

  Further, the extracted map image data around the main cut map image data is also cut out. This map image is hereinafter referred to as sub cut map image data. The sub cut map image data has a data amount of a size suitable for the guide image displayed on the display / operation unit 11 of the in-vehicle device 1, and is eight cut map images around the main cut map image data. It is data.

  For example, the main cut map image data is removed from the cut map image data of M1 to M96 shown in FIG. A further example will be described with reference to FIG. FIG. 18 is an enlarged view of a part of M1 to M7, which is a part of FIG. 17, and eight pieces of cut map image data sub of the main cut map image data M5 shown in FIG. Map image data M2, M8, M4, and M6 adjacent to the top, bottom, left, and right of the cut-out map image data, and map image data M1, M3, M7, and M9 outside the four corners of the main cut-out map image data.

  When the control unit 20 of the portable terminal 2 executes the map image cutting process and preliminarily cuts the sub cut map image and transmits it to the in-vehicle device 1, the control unit 10 of the in-vehicle device 1 displays and operates In the guidance image displayed on the part 11, even if the vehicle position mark d deviates from the route z and deviates from the map image data displayed there, preliminary cut map image data is prepared in advance. Therefore, it is possible to avoid a situation where there is no map image data to be updated and displayed at that time.

  In S207, the control unit 20 of the mobile terminal 2 transmits a predetermined number, for example, nine pieces of cut map image data. The nine pieces of cut-out map image data are one piece of main cut-out map image data in which the vehicle position mark d exists and eight pieces of sub-cut-out map image data.

  Note that the cut-out map image data is assigned the address data given in the route peripheral image data creation process and the cut-out map image ID (for example, M1) newly set after the cut-out. This functions when superimposed on the guidance image displayed on the display / operation unit 11 of the vehicle-mounted device 1 such as the subsequent vehicle position mark d. Details thereof will be described later.

<Data processing>
In S208, the control unit 20 of the mobile terminal 2 adds predetermined data to the decoration data received from the server 3 or the extracted map image data cut out from the route surrounding map image data 1000 by the data processing function. The data processing to be performed is executed.

  The predetermined data to be added is associated with the decoration data and the cut-out map image data decorated by the decoration data in the guide image displayed on the display / operation unit 11 by the control unit 10 when superimposed. There is an image ID (cut-out map image ID) for the image, and further there are coordinate data indicating where the cut-out map image data is displayed and a vehicle position mark d to be added to the current position coordinate data. .

  In addition, when the control unit 10 causes the display / operation unit 11 to superimpose and display data used for the guidance image such as decoration data and cut-out map image data, the data is classified into layers, and data with deep layers includes layers. It is designed to be behind the shallow data. Hereinafter, this layer is referred to as a layer. Therefore, the predetermined data added to the decoration data includes data indicating the layer. The data indicating this layer is display order data indicating the order of displaying preferentially in front of the guide image displayed on the display / operation unit 11 (the order of superimposition).

  For example, the data includes cut-out map image data, facility marks, addresses, own vehicle position marks d, and operation buttons, to which the predetermined data is added. An example of data processed by adding predetermined data will be described with reference to FIG.

  The D1 data is composed of a cutout map image IDi1, data L1 indicating the deepest layer, an address w1, and cutout map image data a.

  The D2 data is composed of a cut-out map image IDi2, data L2 indicating a layer shallower than L1, coordinate data w1, and facility mark b.

  The D3 data is composed of a cut-out map image IDi3, data L3 indicating a layer shallower than L2, coordinate data w3, and address c.

  The D4 data is composed of a cut-out map image IDi4, data L4 indicating a layer shallower than L3, coordinate data w4, and the vehicle position mark d.

  The D5 data is constituted by a cutout map image IDi5, data L5 indicating a layer shallower than L4, coordinate data w5, and an operation button e.

  In S209, the control unit 20 of the mobile terminal 2 transmits the processed decoration data to the in-vehicle device 1.

<Superimposed display processing>
In S <b> 104, the control unit 10 of the in-vehicle device 1 displays the data received from the mobile terminal 2 in a superimposed manner on the guide image displayed on the display / operation unit 11 by the superimposed display function.

  For example, according to the layers included in each data, the control unit 10 sets the cut-out map image data a included in D1 shown in FIG. 19 to the backmost (L1) and sets the facility mark included in D2 as shown in FIG. b is the front of L1 (L2), the address included in D3 is the front of L2 (L3), the vehicle position mark d included in D4 is the front of L3 (L4), and the operation buttons included in D5 are the front of L4 ( A guide image is generated by superimposing them in L5).

  The control unit 10 displays the back data by transparently processing the portions other than the icon data or the character data for the layers L2 to L5 other than L1, and the icon data or the character data. The part prevents the data on the back side from being displayed. Further, since the L1 layer is the rearmost layer, all map images other than the data of the front layer are displayed.

  This superimposed display refers to the cut-out map that the D1 data has by referring to the D1 data that includes the ID that matches the cut-out map image IDi4 of the D4 data in the guide image displayed on the display / operation unit 11 by the control unit 10. The image data a is displayed as the backmost image according to the layer L1. Here, the superposition display is based on the D4 data because the D4 data has the own vehicle position mark d, and the D1 data is referred to from the D4 data to the storage unit 14 of the in-vehicle device 1. This is because the extracted map image having the vehicle position mark d is selected from the nine extracted map images received and stored from the server 3.

  With reference to the D2 data including IDi4, the facility mark b possessed by the D2 data is displayed in front of the cutout map image data a according to the layer L2, and the address and coordinates given to the cutout map image data a Displayed where data matches.

  The D3 data including IDi4 is referenced, and the address, etc., of the D3 data is displayed in front of the facility mark b according to the layer L3, and the address assigned to the cut-out map image data a matches the coordinate data. It is displayed at the place to do.

  With reference to the D4 data including IDi4, the vehicle position mark d held by the D4 data is displayed in front of the address c and the like according to the layer L4, and the address and coordinate data given to the cut-out map image data a It is displayed at the place where matches.

  With reference to the D5 data including IDi4, the operation button e possessed by the D5 data is displayed in front of the vehicle position mark d according to the layer L5, and the address and coordinate data given to the cut-out map image data a It is displayed at the place where matches.

  That is, the control unit 10 of the in-vehicle device 1 determines the display order in the guide image displayed on the display / operation unit 11 according to the depth of the layer included in the received D1 data to D5 data. The data is displayed so that the deeper the layer is, the lower the data is compared to the shallower data. In other words, the depth of the layer is data indicating the order (priority order) in which the control unit 10 displays the image on the front in the guide image displayed on the display / operation unit 11, and the depth of the layer is deep. The priority order is lower, and the lower the layer depth, the higher the priority order.

  As described above, based on the data indicating the priority order added in the control unit 20 of the mobile terminal 2, the control unit 10 of the in-vehicle device 1 superimposes and displays on the guide image of the display / operation unit 11. The data used for the guide images having different transmission timings are superimposed and displayed in an appropriate order.

  The control part 10 of the vehicle equipment 1 will complete | finish an initial process and will transfer to a main process, if the superimposition process is complete | finished.

<Main processing>
While the navigation system 100 is executing the navigation process, it performs main processes such as necessary data provision, data acquisition, and data display.

  In the main process, the in-vehicle device 1 and the mobile terminal 2 that are part of the navigation system 100 execute necessary control processes such as data provision, data acquisition, and data display while the navigation process is being executed.

  In addition, the control part 10 of the vehicle equipment 1 and the control part 20 of the portable terminal 2 divide each control processing time (each task) to be executed by a short time such as several tens of milliseconds. That is, multitask control is performed in which the calculation processing time of the control unit is assigned to each task. Hereinafter, each control process will be described individually.

<Decoration data control processing>
The control unit 20 of the portable terminal 2 executes this control process at a predetermined cycle (a cycle of several tens of milliseconds) by the multitask control function and the decoration data control function. This control will be described with reference to FIG.

  In S110, the control unit 20 of the mobile terminal 2 receives the data of the vehicle speed sensor provided in the vehicle from the in-vehicle device 1, and the received vehicle speed data is equal to or less than a predetermined value (for example, a state where the vehicle travels 1 km / h or less, or It is determined whether or not a stopped state is indicated. When it is determined that the vehicle speed data is equal to or less than the predetermined value, the process proceeds to S111 (Yes in S110). If it is determined that the vehicle speed data is not less than the predetermined value, the process returns to the return (No in S110).

  In S111, the control unit 20 of the mobile terminal 2 processes the decoration data into D2 data and D3 data by the same processing as the data processing described above, and transmits the data to the in-vehicle device 1. The decoration data necessary for decorating the cut-out map image that has already been transmitted from the portable terminal 2 to the vehicle-mounted device 1 is transmitted a predetermined amount of decoration data that has not yet been transmitted. Thereafter, the process proceeds to return.

  Since the control unit 20 transmits the decoration data at such timing, it greatly affects the update display of the vehicle position mark d and the cut-out map image data in the guide image displayed on the display / operation unit 11 of the in-vehicle device 1. Never give. As the control unit 20 of the mobile terminal 2 executes more control processes, each control process tends to be delayed. In particular, the update frequency of the vehicle position mark d superimposed on the guide image is high, so that the other control processes are possible. Control processing should not be executed. However, at this timing, the vehicle is traveling at a low vehicle speed or in a stopped state, and it is not necessary to update the own vehicle position mark d in the guidance image, even if it is necessary to update it. Since it is an update for a small amount of vehicle movement and the update accuracy is not required so much, there are few scenes where the own vehicle position mark d needs to be updated.

  That is, by transmitting decoration data at this timing, of the decoration data and D4 data transmitted from the mobile terminal 2 to the vehicle-mounted device 1, the vehicle position mark d having high importance as an element for exhibiting the navigation function is displayed. While maintaining the update accuracy high in the display / operation unit 11 of the in-vehicle device 1, it is possible to reliably update the update accuracy of the decoration data that is less important than the update accuracy.

<Current position coordinate data control processing>
The control unit 20 of the portable terminal 2 executes the current position coordinate data control process at a predetermined cycle (a cycle of several tens of milliseconds) by the multitask control function and the current position coordinate data control function. This control will be described with reference to FIG.

  In S <b> 112, the control unit 20 of the mobile terminal 2 receives GPS data from the GPS satellite 4.

  In S113, the control unit 20 of the mobile terminal 2 indicates the received GPS data at which address of the route surrounding map image data 1000 the vehicle position mark d is located, as in the current position coordinate data calculation process. Current position coordinate data is calculated.

  In S <b> 114, the control unit 20 of the mobile terminal 2 processes the current position coordinate data into D4 data or the like by the same processing as the data processing described above, and transmits it to the in-vehicle device 1. Thereafter, the process proceeds to return.

  In this control process, the transmission cycle of D4 data to the in-vehicle device 1 is always executed by the control unit 20 in a cycle by the multitask control function. .

<Cut out map image control processing>
The control unit 20 of the portable terminal 2 executes the cutout map image control process at a predetermined cycle (a cycle of several tens of milliseconds) by the multitask control function and the cutout image control function. This control will be described with reference to FIG.

  In S <b> 115, the control unit 20 of the mobile terminal 2 determines whether or not a transmission request for cut map image data has been received from the in-vehicle device 1. If it is determined that a transmission request has been received, the process proceeds to S116 (Yes in S115). When it is determined that the transmission request is not received, the process proceeds to return (No in S115).

  In S116, the control unit 20 of the mobile terminal 2 processes the cut-out map image data that has received the transmission request into D1 data by the same process as the data processing described above, and transmits the D1 data to the in-vehicle device 1. Thereafter, the process proceeds to return.

  The transmission of the D1 data to the in-vehicle device 1 in this control process is executed only when the control unit 10 receives a transmission request for cut map image data from the in-vehicle device 1. More specifically, the transmission request is transmitted by the control unit 10 only when the cut map image data is updated in the cut map image data update display control process executed by the control unit 10 of the vehicle-mounted device 1 to be described later. Is done. Therefore, the transmission cycle of D1 data to the vehicle-mounted device 1 is longer than the transmission cycle of D4 data in the current position coordinate data control process.

<Decoration data update display control processing>
The control unit 10 of the in-vehicle device 1 executes the cut-out map image control process at a predetermined cycle (a cycle of several tens of milliseconds) by the multitask control function and the decoration data update display control function. This control will be described with reference to FIG.

  In S210, the control unit 10 of the in-vehicle device 1 determines whether D2 data or D3 data is received from the mobile terminal 2. When it is determined that D2 data or D3 data has been received, the process proceeds to S211 (Yes in S210). If it is determined that D2 data or D3 data is not received, the process proceeds to return (No in S210).

  In S211, the control unit 10 of the in-vehicle device 1 stores the D2 data or D3 data received from the mobile terminal 2 in the storage unit 14, and the control unit 10 stores the D4 data stored in the storage unit 14 as described above. Superimposition display similar to the display processing is performed. Thereafter, the process proceeds to return.

<Vehicle position mark update display control processing>
The control unit 10 of the in-vehicle device 1 executes the cut-out map image control process at a predetermined cycle (several tens of milliseconds) by the multitask control function and the own vehicle position mark update display control function. This control will be described with reference to FIG.

  In S212, the control unit 10 of the in-vehicle device 1 determines whether or not the D4 data received from the mobile terminal 2 has been received. If it is determined that the D4 data has been received, the process proceeds to S213 (Yes in S212). If it is determined that D4 data is not received, the process proceeds to return (No in S212).

  In S <b> 213, the control unit 10 of the in-vehicle device 1 stores the D4 data received from the mobile terminal 2 in the storage unit 14. The control unit 10 performs the superimposed display similar to the above-described superimposed display process on the D4 data stored in the storage unit 14. Thereafter, the process proceeds to return.

<Cut map image data update display control processing>
The control unit 10 of the in-vehicle device 1 executes the cut-out map image control process at a predetermined cycle (several tens of milliseconds) by the multitask control function and the cut-out map image data update display control function. This control will be described with reference to FIG.

  In S214, the control unit 10 of the in-vehicle device 1 determines whether or not the current position coordinate data included in the D4 data received from the mobile terminal 2 is included in the update area y of the extracted map image data M5 illustrated in FIG. To do. Here, the update area y is an area having a predetermined width around the cut-out map image data in the guide image displayed on the display / operation unit 11, that is, an edge. If the control unit 10 of the in-vehicle device 1 determines that the current position coordinate data is included in the update area y of the extracted map image data, the control unit 10 proceeds to S215 (Yes in S214). If it is not determined that the current position coordinate data is included in the update area y of the map image, the process proceeds to return (No in S214).

  In S215, the control unit 10 of the vehicle-mounted device 1 is a predetermined number (eg, nine) of extracted map image data stored in the storage unit 14, and is to be displayed next on the display / operation unit 11. In the guidance image displayed on the display / operation unit 11, the outgoing map image data is superimposed on other data. The extracted map image data to be displayed next is the position when the vehicle position mark d is included in the update region y in the guide image displayed on the display / operation unit 11 by the control unit 10 of the vehicle-mounted device 1. In the case of the upper part of the cut map image data, it means the cut map image data adjacent to the cut map image data. When the position is the lower part of the cut map image data, the cut map image data If the cut-out map image data next to the cut-out map image data is located on the right side of the cut-out map image data, the cut-out map image data on the right side of the cut-out map image data is said to be the cut-out map. In the case of the left part of the image data, it means the extracted map image data on the left side of the extracted map image data.

  For example, referring to FIG. 18, the control unit 10 of the vehicle-mounted device 1 updates the own vehicle position mark d in the extracted map image data M5 along the route z at the upper part of the extracted map image data M5. When the update display is performed so as to move to, the cut-out map image data M8 adjacent to the cut-out map image data M5 is updated and displayed as a guide image displayed on the display / operation unit 11. Similarly, when the vehicle position mark d is updated and displayed so as to deviate from the route z and move to the update area y in the lower part, right part, and left part of the cut map image data M5, the cut map image data The adjacent cut map image data M2, M3, M4, and M8 of M5 are selected and updated in the guide image displayed on the display / operation unit 11. Thereafter, the process proceeds to S207.

  Note that the control unit 10 determines the adjacency relationship of the cut map image data based on the address given to the cut map image data.

  In S216, the control unit 10 of the in-vehicle device 1 erases the cut-out map image data stored in the storage unit 14 when the cut-out map image data is updated and displayed. This deletion is performed when the control unit 10 arranges the extracted map image data among the nine extracted map image data stored in the storage unit 14 so as to be continuous. Based on the image data, the extracted map image data in the update direction opposite to the direction of the extracted map image data after the update (hereinafter referred to as the update direction) from the clipped map image data before the update and the cutouts on both sides thereof Delete the map image data.

  For example, referring to FIG. 18, the control unit 10 of the vehicle-mounted device 1 updates the own vehicle position mark d in the extracted map image data M5 along the route z at the upper part of the extracted map image data M5. When the updated display is performed so that the extracted map image data M5 is moved, the extracted map image data M8 adjacent to the upper side of the extracted map image data M5 is updated and displayed in the guide image displayed on the display / operation unit 11, and the extracted map before the update is displayed. With the image data M5 as a reference, the cut-out map image data M2 having an update direction opposite to the update direction from the cut-out map image data M5 before the update to the cut-out map image data M8 after the update, The cut map image data M1 and M3 are deleted. Similarly, when the vehicle position mark d deviating from the route z is updated and displayed so as to move to the update area y in the lower part, the right part, and the left part of the extracted map image data M5, the extracted map image data The map image data M5 adjacent to each other is updated and displayed in the guide image displayed on the display / operation unit 11, and the map image data M5 before update is based on the clip map image data M5 before update. Are deleted from each of the extracted map image data having the update direction opposite to the update direction to the respective extracted map image data after update and the adjacent extracted map image data. Thereafter, the process proceeds to S217.

  In S217, the control unit 10 of the in-vehicle device 1 has changed from nine to six by deleting three of the cut map image data stored in the storage unit 14 in S216. A signal requesting that three pieces of cut-out map image data be transmitted is transmitted. That is, the control unit 10 executes control in cooperation with the portable terminal 2 so that a predetermined number (for example, nine) of extracted map image data is always stored in the storage unit 14. The extracted map image data newly requested by the control unit 10 is the extracted map image data in the update direction of the updated extracted map image data and the extracted map image data on both sides thereof. Therefore, the control part 10 transmits ID of those cut map image data to request | require to the portable terminal 2. FIG.

  For example, referring to FIG. 18, the control unit 10 of the vehicle-mounted device 1 updates the own vehicle position mark d in the extracted map image data M5 along the route z at the upper part of the extracted map image data M5. If the update map is displayed so as to move to, the cut map image data M8 adjacent to the cut map image data M5 is updated and displayed on the display / operation unit 11, and the cut map image data M8 is cut in the update direction. The map image data and the IDs of the extracted map image data on both sides thereof are transmitted to the portable terminal 2. That is, the cut map image data M12 in FIG. 17 and the cut map image data M11 and M13 on both sides thereof are transmitted to the portable terminal 2.

  Instead of transmitting the ID of the requested cut-out map image data to the portable terminal 2, the control unit 20 of the portable terminal 2 transmits the ID of the updated cut-out map image data to the portable terminal 2 and the next. It is also possible to determine the cut-out map image data to be transmitted to and transmit the determined cut-out map image data to the in-vehicle device.

<Guidance end determination process>
The control unit 10 of the in-vehicle device 1 determines whether the coordinate data received from the mobile terminal 2 is included in the destination by the guidance end determination function. That is, since the purpose of the navigation system 100 is to guide the user to the destination, when the current position coordinate data is included in the destination included in the extracted map image data, the vehicle has reached the destination. It is assumed that the navigation system 100 is stopped. Therefore, when the control unit 10 determines that the current position coordinate data received from the mobile terminal is included in the destination, the control unit 10 transmits an end notification indicating that the guidance has ended to the mobile terminal 2.

  The control unit 20 of the portable terminal 2 determines whether or not an end notification has been received. If it is determined that an end notification has been received, navigation control such as current position coordinate data calculation processing and current position coordinate data transmission processing ends. .

  The navigation system 100 maintains the extracted map image data constituting the guide image displayed on the display / operation unit 11 of the in-vehicle device 1 and moves the extracted map image data according to the movement of the vehicle. A navigation method is adopted in which the vehicle position mark d is updated and displayed, and the cut map image data is updated and displayed only when the vehicle position mark d moves out of the cut map image data.

  For this reason, in the in-vehicle device 1, the extracted map image data corresponding to the vehicle position mark d indicating the current position is obtained by delaying the acquisition process of the extracted map image data having a relatively large amount of data due to a delay in communication speed or the like. The situation where it cannot superimpose in the guidance image displayed on the display and operation part 11 of the vehicle equipment 1 can be avoided. In other words, the vehicle position mark d can be reflected in the guide image almost in real time. That is, the correspondence relationship between the current position data of the vehicle to be superimposed on the guidance image and the map image data can always be a relationship that represents the actual position of the vehicle.

  Furthermore, when this navigation method is adopted, the own vehicle position mark d is farther in the scene where the own vehicle position mark d and the extracted map image data need to be updated in the display / operation unit 11 of the in-vehicle device 1. As for the amount of data when the vehicle position mark d and the extracted map image data are updated, the extracted map image data is much larger. In such a situation, the mobile terminal 2 makes the update frequency of the extracted map image data amount that is less updated than the own vehicle position mark d and has a large data amount less than the transmission frequency of the own vehicle position mark. ing. In other words, the transmission frequency of the vehicle position mark having a higher update frequency and a smaller amount of data than the extracted map image data is set higher than the transmission frequency of the extracted map image data.

  For this reason, the own vehicle position mark d can be reflected in the guidance image almost in real time without causing a delay in communication between the portable terminal 2 and the in-vehicle device 1. That is, the correspondence relationship between the current position data of the vehicle to be superimposed on the guidance image and the map image data can always be a relationship that represents the actual position of the vehicle.

<2. Second Embodiment>
Next, a second embodiment will be described. In the first embodiment, the navigation system has been described as including the in-vehicle device 1, the portable terminal 2 that is a data providing device, and the server 3. However, the configuration as shown in FIG. The navigation system 101 may be configured to include the in-vehicle device 1 that does not include the portable terminal 2 and the server 3 that is a data providing device.

  In this case, communication is performed between the in-vehicle device 1 and the server 3 to realize a navigation function. The vehicle-mounted device 1 includes a communication unit that communicates with the server 3 to transmit and receive data related to navigation, and the server 3 includes a communication unit that communicates with the vehicle-mounted device 1 and transmits and receives data related to navigation.

  In the above embodiment, the control unit 20 of the mobile terminal 2 uses the current position coordinate data calculation function to locate the vehicle position mark in the route surrounding map image data based on the GPS data received by the GPS communication unit 27. In this case, the control unit 30 of the server 3 executes the process.

  Data amount suitable for the size displayed on the guide image displayed on the display / operation unit 11 of the in-vehicle device 1 from the route peripheral map image data received from the server 3 by the communication unit 28 by the map image cutout processing function by the control unit 20 In this case, the control unit 30 of the server 3 executes the process.

  It has been described that the control unit 20 executes the process of processing the cut-out map image data cut out, the decoration data received from the server 3 by the communication unit 28, and the current position coordinate data by the route data processing processing function. The control unit 30 of the server 3 executes the process.

  Although it has been described that the control unit 20 executes the map matching process based on the vehicle information acquired from the in-vehicle device 1 by the map matching function, in this case, the control unit 30 of the server 3 executes the process.

  Although it has been described that the control unit 20 executes the process of transmitting the decoration data based on the vehicle speed data received from the vehicle-mounted device 1 by the short-range wireless communication unit 29 by the decoration data control processing function, in this case, the control unit of the server 3 30 executes the process.

  Based on the GPS data received by the GPS communication unit 27, the control unit 20 calculates where the vehicle position mark d is located in the coordinates of the extracted map image data by the current position coordinate data control processing function. Although it has been described that the process of transmitting this data to the in-vehicle device 1 at a predetermined timing is performed, in this case, the control unit 30 of the server 3 that has received the GPS data executes the process.

  It has been described that the control unit 20 executes the process of transmitting the cut map image to the vehicle-mounted device 1 at a predetermined timing by the cut map image data control function. In this case, the control unit 30 of the server 3 executes the process. To do.

  In addition, although the said control part 30 of the server 3 performed all the said processes, the control part 10 of the vehicle equipment 1 may perform a part of it.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible. Other embodiments will be described below. Of course, you may combine the form demonstrated below suitably.

<Modification 1>
In the current position coordinate data control process in the first embodiment, the control unit 20 of the portable terminal 2 performs the current position coordinate data control process with a predetermined period (number) by using the multitask control function and the current position coordinate data control function. However, the current position coordinate data control process may be executed based on the vehicle speed data received from the in-vehicle device 1.

  That is, the control unit 20 of the mobile terminal 2 controls the current position coordinate data according to the vehicle speed. When the vehicle speed is low, the cycle for executing the current position coordinate data control process is made longer than the predetermined cycle. For example, when the vehicle speed is 20 Km / h or less, the control unit 20 executes the current position coordinate data control process at a cycle of 1 second.

  Conversely, when the vehicle speed is high, the cycle for executing the current position coordinate data control process is made shorter than the predetermined cycle. For example, when the vehicle speed is 40 Km / h or higher, the control unit 20 executes the current position coordinate data control process at a cycle of 20 milliseconds.

  In the guidance image displayed on the display / operation unit 11 of the vehicle-mounted device 1, when the vehicle position mark d is frequently updated when the vehicle speed is low, the vehicle position mark d may move greatly. Although the update display is not performed and the own vehicle position mark d indicates substantially the same position, the update display is performed for substantially the same position, so that useless processing is executed. Therefore, by executing the current position coordinate data control process at such timing, the load on the control unit 20 in the portable terminal 2 can be reduced, and other control processes can be executed smoothly without delay. it can.

<Modification 2>
In the first embodiment, it has been described that the GPS communication unit is provided in the mobile terminal 2, but the control unit 10 of the in-vehicle device 1 provided in the in-vehicle device 1 uses the current position data of the vehicle received by the GPS communication unit. You may perform the process transmitted to the portable terminal 2 at a predetermined timing.

  Further, in the above-described embodiment, it has been described that various functions are realized in software by the arithmetic processing of the CPU according to the program. However, some of these functions are realized by an electrical hardware circuit. Also good. Conversely, some of the functions realized by the hardware circuit may be realized by software.

  Furthermore, each process in the flowchart for explaining the control of each embodiment is shown as one series for convenience. However, each control unit processes each subdivided process in parallel by the multitask control function. May be.

DESCRIPTION OF SYMBOLS 1 In-vehicle apparatus 2 Portable terminal 3 Server 4 GPS satellite 10 Control part 11 Display and operation part 15 Short-range wireless communication part 20 Control part 21 Short-range wireless communication part 27 GPS communication part 28 Communication part 33 Storage part 34 Communication part a Cutout Map image data b Facility mark c Address d Own vehicle position mark e Operation button z Route

Claims (8)

A navigation system having an in-vehicle device mounted on a vehicle, and a data providing device for providing navigation-related data to the in-vehicle device,
The data providing device includes:
Detecting means for detecting current position data of the vehicle;
Storage means for storing map image data;
Map image cutting means for cutting out a map image of a display size in the in-vehicle device from the map image data;
Transmitting means for individually transmitting the current position data detected by the detecting means and the cut-out map image data cut out by the map image cut-out means to the in-vehicle device;
With
The in-vehicle device is
Receiving means for receiving the current position data and the extracted map image data from the data providing device;
Display means for displaying a guide image by superimposing the received current position data and the extracted map image data;
With
The transmission means makes the transmission cycle of the current position data shorter than the transmission cycle of the cut-out map image data,
The display means updates the current position data while maintaining the extracted map image data when the receiving means receives the current position data, and sets the update position around the extracted map image data. A navigation system that updates the extracted map image data when the current position data is located. The navigation system according to claim 1,
The data providing device includes:
Vehicle speed detection means for detecting the vehicle speed of the vehicle;
The transmitting means transmits a decoration data for decorating the cut-out map image data to an in-vehicle device when the vehicle speed is equal to or lower than a predetermined vehicle speed;
With
The navigation system according to claim 1, wherein the display unit of the vehicle-mounted device displays the guide image by superimposing the current position data, the cut map image data, and the decoration data. The navigation system according to claim 1 or 2,
The data providing device includes:
Means for transmitting display order data indicating an order for superimposing data used for the guide image;
With
The navigation system according to claim 1, wherein the display unit of the in-vehicle device displays the guide image by superimposing data based on the display order data. The navigation system according to any one of claims 1 to 3,
The map image cutout means of the data providing device cuts out a route map image along a guide route to a destination and an adjacent map image adjacent to the route map image as the cutout map image data,
The display unit of the vehicle-mounted device uses the cut-out map image used for the guide image from the route map image and the adjacent map image based on the current position data when updating the cut-out map image data. A navigation system characterized by selecting data. An in-vehicle device mounted on a vehicle that receives navigation-related data from a data providing device,
The data providing device detects current position data of the vehicle, cuts out clipped map image data having a display size in the in-vehicle device from the accumulated map image data, and detects the detected current position data and the cutout Map image data and individually transmitted to the in-vehicle device, the transmission position of the current position data is shorter than the transmission period of the cut map image data,
Receiving means for receiving the current position data and the extracted map image data from the data providing device;
Display means for displaying a guide image by superimposing the received current position data and the extracted map image data;
With
The display means updates the current position data while maintaining the extracted map image data when the receiving means receives the current position data, and sets the update position around the extracted map image data. The vehicle-mounted device, wherein the cut-out map image data is updated when the current position data is located. The in-vehicle device according to claim 5,
Means for receiving, from the data providing device, display order data indicating an order in which data used for the guide image is superimposed;
Further comprising
The in-vehicle device, wherein the display means displays the guide image by superimposing data based on the display order data. A navigation method in a navigation system having an in-vehicle device mounted on a vehicle and a data providing device that provides data related to navigation to the in-vehicle device,
A detection step in which the data providing device detects current position data of the vehicle;
A map image cutting step in which the data providing device cuts out a map image of a display size in the in-vehicle device from the stored map image data;
The data providing device transmits the detected current position data and the extracted cutout map image data to be stored individually to the in-vehicle device, and
The vehicle-mounted device receives the current position data and the cut map image data from the data providing device;
A display step in which the in-vehicle device superimposes the received current position data and the extracted map image data to display a guide image;
With
In the transmission step, a transmission cycle of the current position data is shorter than a transmission cycle of the cut-out map image data,
In the display step, when the current position data is received, the current position data is updated while maintaining the extracted map image data, and the current position data is updated to an update position around the extracted map image data. A navigation method characterized by updating the cut-out map image data when a position is located. A program mounted on a vehicle and executable by a computer included in an in-vehicle device that receives navigation-related data from a data providing device,
The data providing device detects current position data of the vehicle, cuts out clipped map image data having a display size in the in-vehicle device from the accumulated map image data, and detects the detected current position data and the cutout While transmitting map image data individually to the in-vehicle device, the transmission cycle of the current position data is shorter than the transmission cycle of the cut-out map image data,
Execution of the program by the computer causes the computer to
Receiving the current position data and the extracted map image data from the data providing device;
Displaying the guidance image by superimposing the received current position data and the extracted map image data;
When receiving the current position data, maintaining the extracted map image data, updating the current position data;
Updating the extracted map image data when the current position data is located at an update position around the extracted map image data;
A program characterized by having executed.

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